Process of detinning.



UNITED STATES PATEN'J. OFFICE.

HARRY M. FERNBERGER, OF DOLLAR BAY, MICHIGAN, AND WILLLAM W. MURRA Y, OF PlIiLA- DELPHIA, PENNSYLVANIA.

PROCESS OF DETINNING.

Specification of Letters Patent.

Patent ed Feb. 23, 1909.

Application filed January 17, 1906. Serial No. 296,569.

.Houghton and State of Michigan, and F11.-

LIAM W. MURRAY, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Process of Detinning, of which the following is a specification.

Our invention relates to a certain new and useful im rovement in the process of detinnin'g, an it particularly seeks to provide a recess in which tin scr'a such as clippings rorn tin plate, tinned mil cans, old tin cans, and any other tin scrap, can be freed of their tin in,a quick and efficient manner by use of a solvent that will dissolve the tin without attackin to an a preciable extent, the iron and ot er like su stances.

Our invention also has for its object. to

provide such a solvent as. can be continu ously reused, will bev anhydrous, insoluble in Water, a solvent for stannic chlorid (Such), a

non-solvent for ferric chlorid (Fecl l, a sol-- vent for anhydrous chlorin (Cl) and which will be a solvent for greases, fats and the like, thus enabling the tin scrap to be dissolved Without previous treatment with caustic to remove the fat and grease and clean the scrap.

In carrying out our improved process we make use. of an or anic com ound, suc as carbon tetra chlori (COL) w ich has all the properties above referred to, namely, it is anhydrous insoluble in water (H O), a solvent for stannic chlorid (SnCL), dissolves chlorin as (C1,), will not dissolve ferric chlorid FeCl but dissolves greases and fats, etc. l

The manner in which our process is performed is as follows z-We lace the scrap tin in a suitable retort or c osed vessel, and cover the sore with carbon tetra chlorid (C(lh) after wiich anhydrous chlorin gas 5 (C1,) is passed into the vessel until the carbon tetra chlorid has been saturated and the tin dissolved off the scrap, into a solvent (CCIQ as a stannic chlorid (SnCL). Any iron chlorid I (FeCl which may possibl be formed during this step of our process llein insoluble in carbon tetra chlorid (COL) an in stannic chlorid (81161,) will remain undissolved. The solution of stannic chlorid in carbon tetra chlorid is then withdrawn from the iron residue, which consists of a little ferric chlorid and scrap iron. The iron residue may be Washed with fresh solvent (C01,) or water and heated to recover the last traces of carbon tetra chlorid. The solution of stannic chlorid in carbon tetra chlorid is next filtered and then agitated or boiled with water with a return condenser.

The stannic chlorid beingsoluble in water,

'will be dissolved thereby to form aqueous solution of stannic chlorid; the solvent (CCL) being insoluble in Water, will not be affected thereby. If this mixture of solvent (carbon tetra chlorid) and aqueous solution of stannic chlorid be allowed to rest the aqueous solution of stannic chlorid will separate from the carbon tetra chlorid and can be drawn off in any suitable manner. The carbon tetra chlorid is now ready to be re* turned to the retort and usedin a succeeding operation.

The aqueous solution of stannic chlorid can be made of any desired strength and urity. In this condition, it is free from such nnpurities as iron and lead chloride, which are present in quantities in the material we propose to handle.

In our process the solvent, carbon tetra chlorid, can be reused with. verv little loss; the stannic chlorid is chemically pure and. can be made of any desired stren th.

Our process is also equally a aptcd for producing titanium chlorid, free from fcrric chlorid and from mixtures of alloys of iron and titanium and other metals of the tin group. Again, by our process, we can. obtain aqueous solutions of chloride of tin, anti mony, phosphorous, arsenic, etc., etc. i'rcc from the 'chlorids of such metals as lead, iron, etc. etc.

In our process, the solvent used, carbon tetra chlorid, has a very low boiling point, and the iron salts, lead salts and other salts which may be formed or )lPSlZllh in tho muterial operated uion, will not contaminate the stannic chlork produced by this method, on account of th ir iusolubillty in the organic mcnstruum.

As an exam )10 of the equivalent of carbon-- tetra'chlorid i'or use in our process, which fulfils .the requirements herelnbeforo spcci fied of a solvent such as carbontetrachlorid, we may mention the factthat we may use in place of carbon-tetra-chlorid, which is the most referable compound, any other liquid chlori of the methane series of hydro-car- US, tin scrap Cl gas S SnCl C01,).

From the foregoing description, it is thought the complete process and manner of performing the same, as well as its many advantages over the prior art will be readily understood by those skilled in the art to which it appertains.

In this application we make no claim, per se, to the treating of the detinned residues with an anhydrous organic liquid to remove traces of stannic chlorid, as that forms the subject-matter ot a divisional application.

hat we claim, is

1. The method consisting in subjecting tin associated with a metal, the chlorid of which is not soluble in carbon tebrachlorid, to the action of chlorin and carbon tetrachlorid, separating the solution of stannic chlorid from the residue, and separating the stannic chlorid from its solvent.

2. The method consistin in subjecting tin, associated with 8. meta, the chlorid of which is not soluble in carbon tetrachlorid, to the action of chlorin and carbon tetrachlorid, separating the solution of stannic chlorid from the residue, and adding water in quantity suflicient to separate th'estannic chlorid from said solvent.

3. The process of detinning, which consists in subjecting the tinned metal to the action of an anhydrous organic liquid solvent of the methane series which is insoluble in water and capable of dissolving stannic chlorid and contains dissolved anhydrous chlorin.

4. A process of detinning, consisting of subjecting the tinned metal to the action of chlorin as dissolved in anhydrous or anic li uid o the methane series capable 0- disso ving the anhydrous chloridsof metals of the tin group and capable of dissolving grease, fats, etc.

5. The rocess of detinning, which consists in su jecting the tinned, metal to the action of anhydrous carbon tetra chlorid, containing dissolved chlorin.

6. The process of detinning, which consists in subjectin the tinned metal to the action of an anhy rous liquid solvent, which isinsoluble in waterand capable of dissolving stannic chlorid, and contains dissolved anhydrous chlorin, until the tin is changed to stannic chlorid, then Withdrawing the solution of stannic chlorid in the anhydrous solvent, from the residue, and subjecting it to the action of water, substantially as specified.

. 7. A process, of detinning, consisting in subjecting the tinned metal to the action of chlorin gas dissolved in an anhydrous organic li uid capable of dissolving the anhydrous ch orids of metals of the tin group, and capable of dissolving grease, fats, etc. then treating the solution of chloride in the organlc 1 chloride of the tin group and then separating the aqueous solvent from the organic liquid, substantially as specified.

8. The rocess of detinning, which consists in en j'ectin the tinned metal to the action of an anhydrous liquid solvent, which is insoluble in water and capable of dissolving chlorid of tin, and contains dissolved an hydrous chlorin, until the tin is changed,to a chlorid of tin, then Withdrawingthe solution of chlorid of tin in the anhydrous solvent, from theresidue, and subjecting it to the action of Water, to se arate the tin chlorid from the anhydrous so vent.

-' 9. The recess of detinning, which consists in su jectin the tinned metal to the action of..an anhy rous liquid solvent, which is insoluble in water and capableof dissolvinglstannic chlorid and containing dissolved an ydrous chlorin, until the tin is changed .to stannic chlorid, then Withdrawing the solution of stannic chlorid in the anhydrous solven't,'from the residue, subjectin said solu tion to the action of water to issolve the stannic chlorid and 'then drawing off the aqueous solution of the stannic chlorid from the anhydrous solvent.

10. A process of detinning consisting in subjecting the tinned metal to the action of chlorin gas dissolved in an anhydrous oranic li uid ca able of dissolving the anhyrous ch orid o metals of the tin group and capable of dissolving grease, fats, etc. then treating the solution of chlorid in the organic. liquid with water, and then separating the aqlueous solvent from the organic liquid, su stantially as s ecified.

HAR Y M. FERNBERGER. WILLIAM W. MURRAY. Witnesses to H. M. Fernbergers signature:

COLIN A. MCLEAN, I. C. DUNSTAN. Witnesses to W. W. Murrays signature:

HATTIE T. MURRAY,

J. V. MONAGHAN.

quid With water to dissolve the 

